Brokers using LOIs to gate-keep early

I've been finding many of the brokers I'm dealing with are only offering single-page teasers post NDA. After requesting more information, I'm given a boilerplate response along the lines of: "Our process requires submission of an LOI before distributing further information."

Is anybody else finding this? Is this a new approach for brokers to weed out tire-kicking Searchers?

One mentor of mine said just to issue a relatively vague yet professional LOI with the expectations of re-trading. I'd be more comfortable doing this with an IOI, but it seems like submitting IOIs doesn't satisfy the brokers. I'm hesitant to spend time on deals that I'd expect to re-trade, but is this part of the process in 2025?